11/05/17

a sample of an ideal gas has a volume of 2.25 L at 288 K and 1.06 atm. Calculate the pressure when the volume is 1.07 L and the temperature is 3.00 x 10^2 K.
in atm. chapter 7 chemistry 121
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11/05/17

a hot air ballon is filled with 1.27 x 10^6 L of an ideal gas on a cooling morning (11 degrees C). the air is heated to 121 degrees C.
What is the volume of the air in the ballon after it is heated? assume that none of the gas escapes from the ballon 
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11/05/17

an ideal gas in a sealed container has an initial volume of 2.65 L. at constant pressure, it is cooled to 18.00 degrees C where its final volume is 1.75 L.
what was the initial temperature?
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11/05/17

Half life of radium (PRECALCULUS HELP PLEASE)
The half life of radium is approximately 1690 years. If a lab has 50mg of Radium, find how long it takes for the substance to decay to 40mg, to the nearest year.
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11/05/17

How do you convert?
I have three questions from chemistry that I don't understand please help and can I get step-by-step work so I can understand how to do this for myself. 1. Convert 52.7 pints to cm3. 2. Convert... more
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11/05/17

Entropy - Thermodynamics
When 50g of water is heated from 0°C to 100°C. Find the entropy.  
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11/05/17

Explain oxidation and reduction , respectively.
Calculate the coefficients of the redox reactions of ①-③, and finish the ionic equations.The equation of oxidation half reaction and the equation of reduction half reaction are multiplied... more
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11/04/17

Question dealing with gravimetric analysis lab.
Approximately how many mL of 5% BaCl22H2O solution would be required to precipitate all the sulfate if we assume that your samples are pure sodium sulfate? Assume that the density of the barium... more
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11/04/17

Can you help me with this AP Chemistry problem?
20. Calculate ∆H for the reaction of sulfur dioxide with oxygen. 2SO2 (g) + O2 (g) → 2SO3 (g) (∆Hf 0 SO2 (g) = –296.8 kJ/mol; ∆Hf 0 SO3 (g) = –395.7 kJ/mol) a. –98.9 kJ c. 197.8 kJ b. –197.8 kJ d.... more
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11/04/17

How do I solve this enthalpy problem involving the formation of rust?
∆Hf 0 for the formation of rust (Fe2O3 ) is –826 kJ/mol. How much energy is involved in the formation of 5 grams of rust? a. 25.9 kJ c. 66 kJ b. 25.9 J d. 66 J
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11/04/17

How do I solve a heat of reaction problem similar to this one?
18. For which one of the following reactions is the heat of the reaction also a heat of formation of the product?a) N2(g) + 3H2(g) ----> 2NH3(g)b) (1/2)N2(g) + O2(g) ----> NO2(g)c) 6C(s) +... more
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11/04/17

How do I solve a heat of formation similar to this one?
17. Given the following heats of formation: SO2(g) = -297 kJ/mole, SO3(g) = -396 kJ/moledetermine the heat of reaction (in kJ) for 2SO2(g) + O2(g) ----> 2SO3(g)a) -99 c) 99b) -198 d) 198
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11/04/17

How do I solve an AP Chemistry problem similar to this one?
11. 3N2O(g) + 2NH3(g) -----> 4N2(g) + 3H2O(g) Enthalpy change = -879.6 kJWhat is the heat of formation for N2O in kJ/mole (heats of formation: NH3 = -45.9 kJ/mole and H2O = -241.8 kJ/mole)?a)... more
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11/04/17

How do I solve a heat of formation problem like this?
11. 3N2O(g) + 2NH3(g) -----> 4N2(g) + 3H2O(g) Enthalpy change = -879.6 kJWhat is the heat of formation for N2O in kJ/mole (heats of formation: NH3 = -45.9 kJ/mole and H2O = -241.8 kJ/mole)?a)... more
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11/04/17

How do I solve change in enthalpy problems like this?
3. 2Al(s) + 3O2(g) -----> 2Al2O3(s) enthalpy change is -3351 kJWhat would be the enthalpy change (in kJ) for the formation of 65.0 g of Al2O3(s)?a) -251000b) -126000c) -2464d) -1232
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11/03/17

Matthew's airplane flew 36.5 centimeters and Ethan's flew 18 centimeters. How many inches farther did Matthew's fly than Ethan's?
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11/03/17

How do I solve this problem on a reaction between Ba (OH)2 and H2SO4?
30 mL of 0.10M Ba (OH)2 (aq) is added to 30 mL of 0.10 M H2SO4 and the solution is stirred quickly. The rise is temperate T 1 is measured. The experiment is repeated using 90 mL of each solution... more
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11/03/17

How do I solve this problem on a reaction between a NH3 and HCl?
When 0.157 lol NH3 is reacted with excess HCl, 6.91 kJ of energy is released as heat. How do I calculate the energy change per mole of NH3?
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11/03/17

How do I solve this AP Chemistry problem?
1/2O2 (g)+ Hg (l)====> HgO (s) ΔH= -90.8 kJ. How do I calculate how much heat is released when 42.5g of By is reacted with oxygen
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11/03/17

How do I solve this heat of formation problem?
3Al (s)+3O2 (g)===> 2AlO3 (s) ΔH= -3351kJ How do I calculate the change in enthalpy in kJ for the formation of 65.0 g of Al2O3?
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11/03/17

How do I solve this enthalpy of formation problem?
The heats of combustion of C, H2, and CH4 at 298K and 1 atm are respectively -393 kJ/mol, -286 kJ/mol, and -892 kJ/lol. How do I calculate the enthalpy of formation for CH4 using the given... more
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11/03/17

Can you help me with this phase change thermochemistry problem?
How do I calculate how much heat energy is required to hear a 150g sample of ice initially At -14°C to 30°C?.   I know that I am supposed to use the equation q=mcΔT at some point, but I am not... more
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11/02/17

writing a balanced net ionic equation and finding K
Write a balanced net ionic equation to show why the solubility of Pb(OH)2(s) increases in the presence of a strong acid and calculate the equilibrium constant for the reaction of this sparingly... more
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11/02/17

Use the reaction quotient to predict whether a precipitate will form.
If 12.0 mL of 3.12×10-4 M MgI2 are added to 25.0 mL of 2.80×10-5 M NaF, will solid MgF2 (Ksp = 6.4×10-9) precipitate? If a precipitate will not form, what fluoride ion concentration will cause a... more
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11/02/17

a mass of 380 kg is divided into ratio of 1:3:4
it is aratio and prorpotion question and you will have to find two different units of masses 
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